Hi Andrew.
Yes that link above should se you right
your control box will look like this below, the purple wire is done away with when converting.
1
What you will be re-routing your control box to but using one of the brown wires as a black, the other one is also done away with.
2
I will leave at that for now so not to much confusion is added, until you can tackle the change over, if you need anymore photo's let me know cheers Arctic.